If you are referring to the Pokemon Roggenrola, then it evolves at level 25, then you must link trade it to get it to its last evolution.
It does not evolve by level. You need to give it a sun stone for it to evolve.
Lillipup can evolve at Level 16.
Level it up to level 50, then it will evolve into Zweilous. Level it up to level 64, to evolve it into Hydreigon.
Virizion does not evolve.
Level it to 41 and it will evolve
watchog does not evolve
To evolve Mantyke in pokemon black/white 2 you have to level it up with a remoraid in your party then it will evolve into mantine
at level 31.
In Pokémon Black, Timburr will evolve starting at Level 25.
You can evolve a Gabite by leveling it up to level 48.
Lairon will evolve once it hits Level 42.
Alomomola does NOT evolve.